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Oaks (Quercus Spp.): a Brief History

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Oaks (Quercus Spp.): a Brief History Publication WSFNR-20-25A April 2020 Oaks (Quercus spp.): A Brief History Dr. Kim D. Coder, Professor of Tree Biology & Health Care / University Hill Fellow University of Georgia Warnell School of Forestry & Natural Resources Quercus (oak) is the largest tree genus in temperate and sub-tropical areas of the Northern Hemisphere with an extensive distribution. (Denk et.al. 2010) Oaks are the most dominant trees of North America both in species number and biomass. (Hipp et.al. 2018) The three North America oak groups (white, red / black, and golden-cup) represent roughly 60% (~255) of the ~435 species within the Quercus genus worldwide. (Hipp et.al. 2018; McVay et.al. 2017a) Oak group development over time helped determine current species, and can suggest relationships which foster hybridization. The red / black and white oaks developed during a warm phase in global climate at high latitudes in what today is the boreal forest zone. From this northern location, both oak groups spread together southward across the continent splitting into a large eastern United States pathway, and much smaller western and far western paths. Both species groups spread into the eastern United States, then southward, and continued into Mexico and Central America as far as Columbia. (Hipp et.al. 2018) Today, Mexico is considered the world center of oak diversity. (Hipp et.al. 2018) Figure 1 shows genus, sub-genus and sections of Quercus (oak). History of Oak Species Groups Oaks developed under much different climates and environments than today. By examining how oaks developed and diversified into small, closely related groups, the native set of Georgia oak species can be better appreciated and understood in how they are related, share gene sets, or hybridize. Oaks have migrated widely, driven by climatic change, especially under changing temperature, precipitation, edaphic (soil) and climatic variability or disturbance. Across time, oaks have adapted to and thrived under local weather and topographic conditions, as well as interference (competition + allelopathy) from other oak species and other forest / woodland trees. Oaks have continued to adapt and diversify under geographic isolation – in valleys and plains, along ridges and coasts, and scattered across mountain ranges. The beginnings of what would become the oaks can be traced in the fossil record back more than a 100 million years ago (i.e. 100mya). There has been much gene flow and exchange of tree families and species between continents and across the Northern Hemisphere over the last 150 million years, or since the beginning of the Cretaceous. Figure 2 defines the geologic time periods used here. North America and Iberia (Spain / Portugal area) were connected around 154mya, and North America and Northern Europe were connected 131mya. (Brikiatis 2016). The rise of Angiosperm trees occurred when there was much interconnection of landmasses with the Northern Hemisphere. Oaks (Quercus spp.): A Brief History K.D. Coder Land Bridges In addition to early large continental connections, North America has experienced five ephemeral connections with other landmasses over the last 100 million years. Oaks migrated over both the Beringia (Bering Sea) and North Atlantic land bridges, spreading widely. These connections occurred in the Paleocene (61mya), Eocene (45mya), Oligocene (28mya – Beringia only), Miocene (15mya), and Pliocene (5.3mya). (Graham 2018) Many tree species groups of North America arose during the 110mya to 80mya time period leading to our modern tree families and species. The beech family (Fagaceae), and predecessors of oaks (Quercus), have been recognizable since around 100mya. The beech family developed in Asia and migrated back and forth across Beringia. (Manos & Stanford 2001) The modern represenatives of the beech family are shown in Figure 3. The beech family is currently listed with ten genera and about 925 species. (Manos et.al. 2001) The Quercus genus developed as a North American split from Asiatic beech family groups, eventually dispersing further to Eurasia over the North American land bridges. (Manos & Stanford 2001) Mountain & Oak Rise Just after the rise of the Rocky Mountains between 80-55mya, divergence of old and new world oaks began around 55mya in the northern areas of the Northern Hemisphere. (Hipp et.al. 2018; Hubert et.al. 2014; Manos & Stanford 2001) The modern oak genus is considered to have been established in the high latitudes of North America, around the Paleocene-Eocene time boundary (56mya). (Hipp et.al. 2018; Hubert et.al. 2014). The climate at this time was very warm with atmospheric carbon-dioxide at twice today’s levels. By 45mya, the old world oaks were diverging into the cycle-cup oaks (Cyclobalanopsis) and the Ilex / Cerris oak groups. (Hubert et.al. 2014) The new world high latitude oaks started to radiate and diversify southward across North America by 35mya. (Cavender-Bares et.al. 2018) Figure 4. Global temperatures decreased ~8oF around 34mya and oaks were pushed further southward. (Hipp et.al. 2018) Southward As oaks were forced south, this was a time of divergence between the new world red / black oak group (Lobatae), and the white / golden-cup oaks (Quercus / Protobalanus) (34mya). (Hipp et.al. 2018; Hubert et.al. 2014) Although some researchers have placed this divergence later at 28 mya. (Hipp et.al. 2014) Both white oaks in general, and the Roburoids (Eurasian white oaks) specifically, were of New World origins with multiple movements and exchanges into Eurasia. (Crowl et.al. 2019; McVay et.al. 2017a) Around 33-34mya the Californian, Eastern United States, Eurasian, and Northern Mexico white oak groups began to develop and separate. (Hipp et.al. 2018) Red / black, white, and golden cup oak group were present by 30mya. (Cavender-Bares et.al. 2018) The golden-cup oaks (Protobalanus) separated from the white oaks roughly 25mya and were widely distributed across all of North America in the Paleogene (23-25 mya). (Denk et.al. 2017; Hipp et.al. 2018) Some researchers place this divergence much later (i.e. 15mya). (Hubert et.al. 2014) The Roburoids (Eurasian white oaks) also split from Eastern North American white oaks by 25mya. (Denk et.al. 2017) The predecessors of the Roburoids migrated a number of times across the North Atlantic land bridges. (Crowl et.al. 2019) 2 Oaks (Quercus spp.): A Brief History K.D. Coder Diversify By the end of the Paleogene / start of the Neogene (23mya), wide-spread radiation and diversification of white oaks across North America and the rest of the Northern Hemisphere had occurred. (Denk et.al. 2017) Red / black and white oaks together had widely colonized both eastern and western North America by 20mya. (Cavender-Bares et.al. 2018) A period of rapid diversification of oaks occurred between 18mya and 12mya, leading to more Eurasian white oaks, Mexican / Texas white oaks, United States southwest white oaks, and Mexican red oaks. (Hipp et.al. 2018) The Mexican and Central American oaks diversified at roughly twice the rate of the rest of North American oaks between 16mya to 10mya. (Hipp et.al. 2018) Old world oaks underwent a divergence period around 18mya between the Ilex and Cerris oak groups. (Hubert et.al. 2014) By the middle Miocene (15mya) white oaks covered North America from mid-latitudes to arctic regions. (Denk et.al. 2010) As Sierran (15-10mya) and Cascade (17-15mya) mountains were thrust up, populations of some far western oaks were isolated. Diversification of far western red oaks (Quercus section Lobatae series Agrifoliae) occurred around 15mya. This was a period of changing climate with increasing warming and aridity. (Hauser et.al. 2017) A number of oak species have remained unchanged since the Miocene (15mya), especially in temperate zones. (Petit et.al. 2003) Between 15mya and 11mya in the Eastern United States, southern live oaks evolved, although some authors place this development much farther back in time (i.e. 30mya). (Hipp et.al. 2018; McVay et.al. 2017a) Figure 5. Last Colonist Gene flow between New World white oaks and Old World white oaks had been occurring relatively often until 5.5mya across North Atlantic land bridges, and the Beringia land bridge. (Hubert et.al. 2014) North American deciduous red and white oaks had crossed a North Atlantic land bridge around 8-9mya (under a warm climate), and again around 5.5-6mya (under a cool climate). (Denk et.al. 2010; Denk et.al. 2017) Eurasian and American white oaks finally were separated after 5.5mya. (Denk et.al. 2010) The red oaks were not successful in colonizing Europe, falling back to North America. By start of the Pliocene (5.3mya), the last large changes to oak species diversification were occurring. (Hipp et.al. 2018) Interbreeding between the Dumosae group of what is today the far western white oaks and the Prinoideae (chestnut oaks) in today’s eastern North America, occurrred. (Crowl et.al. 2019) The golden cup oaks (Protobalanus) were restricted to western North America during the Neogene (5 mya). (Denk et.al. 2017) By the beginning of the Pleistocene at 2.6 mya, and the beginning of the ice ages, the oak genus, groups, and species were considered genetically set and would have been recognizable today. (Hipp et.al. 2018) Last Ice Age In the last 15,000 to 18,000 years, North America saw its most recent ice sheet covering large parts of the Eastern United States. Figure 6 shows the ice sheet extent and extended coastal area due to a lowered sea level. All tree species were pushed South by the ice front to refuges in the Southern United States. Figure 7. Some species were pushed onto the exposed coastal flatwoods and some were driven into the sea. After glaciation, all of the oak species remaining began to migrate northward under improving climatic conditions. Figure 8. Oaks moved back up the Mississippi River Valley and along the western side of the Appalachians, filling valleys, mountainsides, and plains.
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